171697

Properties

Appears in sequences

• Numerators of continued fraction convergents to sqrt(438).at n=7A041834
• Primes of the form 2*p^2 - 1, where p is prime.at n=23A092057
• a(n) = 4802*n^2 - 196*n + 1.at n=5A157364
• Primes of the form 2*p^k-1, where p is prime and k > 1.at n=36A178491
• Numbers k such that sigma((k + 1) / 2) is a prime q.at n=22A292446
• Primes p such that sigma((p + 1) / 2) is a prime q.at n=12A292447
• Prime k with sigma(sigma(sigma(k))) < 3*k + 1.at n=32A320517
• Primes p such that p == 1 (mod A001414(p-1)) and p == 1 (mod A001414(p+1)).at n=17A339181
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = n! * Sum_{j=0..n} binomial(k*j,n-j)/j!.at n=62A361277
• Expansion of e.g.f. exp(x * (1+x)^3).at n=7A361279
• Prime numbersat n=15641